| | | pp. 777–796 Compositional variation in the chevkinite group: new data from igneous and metamorphic rocks...Geological Survey, 956 National Center, Reston, VA 20192, USA 4 Camborne School of Mines, School of Geography,...microprobe analyses are presented of chevkinite-group minerals from Canada, USA, Guatemala, Norway, Scotland...slightly the range of compositions in the chevkinite group, e.g. the most MgO-rich phases yet recorded...Patchilyzoned crystals from Virginia and Guatemala contain both perrierite and chevkinite compositions. The new | | Macdonald, R., Bagiński, B., Kartashov, P., Zozulya, D., Dzierżanowski, P. (2012) Chevkinite-group minerals from Russia and Mongolia: new compositional data from metasomatites and ore deposits. Mineralogical Magazine, 76 (3) 535-549 doi:10.1180/minmag.2012.076.3.06 | Journal (article/letter/editorial) | Magazine, June 2012, Vol. 76(3), pp. 535–549 Chevkinite-group minerals from Russia and Mongolia: new compositional...Electron-microprobe analyses of Russian and Mongolian chevkinite-group minerals from little-known host lithologies...presented. The mineral species analysed include chevkinite-(Ce), perrierite-(Ce), polyakovite-(Ce) and Sr-...Compositional variation in the Sr-rich members of the group is broadly represented by the exchange vector (Fe...Ti + Zr). Despite the varied parageneses, the chevkinite-(Ce) compositions are similar to previously published | | Stachowicz, Marcin, Bagiński, Bogusław, Welch, Mark D., Kartashov, Pavel M., Macdonald, Ray, Balcerzak, Jacek, Tyczkowski, Jacek, Woźniak, Krzysztof (2019) Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): X-ray diffraction and photoelectron spectroscopy studies and mechanisms of Nb enrichment. American Mineralogist, 104 (4) 595-602 doi:10.2138/am-2019-6457 | Journal (article/letter/editorial) | breaking in the crystal-chemically complex mineral chevkinite-(Ce): X-ray diffraction and photoelectron spectroscopy...Abstract The crystal structures of natural Nb-rich chevkinite-(Ce) from the Biraya rare-metal deposit, Russia...Typically, Nb-rich chevkinite-(Ce) has space group C2/m, but specimens with space group P21/a were also...The general formula for the Nb-rich chevkinite-(Ce) having space group C2/m is (Ce3+,La3+,Nd3+,Pr3+,Ca2+...DNb5+, niobium can also be incorporated into chevkinite-(Ce) by the substitution 2DTi4+ ↔ DNb5+ + DTi3+ | | Macdonald, Ray, Bagiński, Bogusław, Belkin, Harvey E., Stachowicz, Marcin (2019) Composition, paragenesis, and alteration of the chevkinite group of minerals. American Mineralogist, 104 (3) 348-369 doi:10.2138/am-2019-6772 | Journal (article/letter/editorial) | Composition, paragenesis, and alteration of the chevkinite group of minerals Ray Macdonald1,2, Bogusław Bagiński1...Forest Edge Drive, Reston, Virginia 20190-4026, U.S.A. Abstract The chevkinite-group minerals (CGM) are dominantly...will undoubtedly be identified. Minerals of the group are known from hundreds of terrestrial localities...skarns and fenites, and in rare-metal deposits. Chevkinite-group minerals may form over the pressure range...redistribution during these processes. Keywords: Chevkinite-group, structure, composition, occurrence, alteration | | | Book (edition) | to the chemical formula, allegiance to a mineral group, symmetry and crystal structure as well as the strongest...chemical formula, structure (crystal system, space group, and unit cell dimensions), and at least some other...site occupancy. The Sb members of the tennantite group (2.G) will serve as a good example: tetrahedrite...registered in this book (e.g. in the amphibole group). For more detailed information see "Dana's System...abbreviations: Rep. (republic), prov. (province), co. (county), munic. (municipio), pref. (prefecture), dept |
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